Actually it was RCA who made the pink ceramic insulators. It was
Frenchtown ceramic, and the material came from mines in NJ. A trace of
chromium gave it the good characteristics over plain alumina ceramic. It
was very strong and had excellent dielectric characteristics for high
frequencies. Later, they moved to bone white ceramic, from Morgan. Other
companies like Coors and Kyocera were available and sometimes used as
well. Burle Industries was the company that bought RCA's high power tube
production in Lancaster, PA. (Mr. Burlefinger was a former RCA manager).
In more recent years, Photonis (of France) owns the company. We still
have one RF system at work running with Photonis/Burle/RCA tubes, but no
pink ones anymore.
Svetlana had a similar ceramic, which was a little more purple than
Frenchtown pink, but had great performance as well.
73
John
K5PRO
Date: Wed, 27 Dec 2017 20:46:57 -0600
From: "Jim W7RY" <jimw7ry@gmail.com>
To: "Alek Petkovic" <vk6apk@bigpond.com>
Cc: "AMPS" <amps@contesting.com>
Subject: Re: [Amps] Life of tubes in ham service
They were probably Burle brand? They were famous for pink ceramic. RCA made
a few too.
73
Jim W7RY
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